Describe and discuss the results of two experiments, one using plants and the other using animals, that
support the totipotency of some cells. Emphasize the differences between manipulation of plant and
animal cells in your discussion. What will be an ideal response?
Concepts to Consider: Totipotency of cells as it relates to the developmental stage of the donor cell,
particularly in animals; also, the interpretation of the result
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What assumption is made by researchers when designing experiments to model how life may have arisen on Earth?
a. The chemical reactions of living things are only possible inside living systems. b. Living organisms are composed of elements commonly found on Earth, but absent in the rest of the universe. c. Conditions on Earth have not changed over time. d. Life arose on Earth from non-living matter. e. The development of living cells from nonliving matter was very rapid.
Drugs like aziodothymidine (AZT) work against HIV infections by inhibiting
A. the cleaving of proteins needed to make the protein coat of a virus. B. host cells from reproducing. C. viral DNA from inserting into the host chromosome. D. viruses from entering a host cell. E. reverse transcriptase.
These biological compounds are nonpolar and insoluble in water
A. nucleic acids B. lipids C. carbohydrates D. proteins
The ________ is the first embryonic membrane to appear, and it is the first site of ________.
A. yolk sac, blood cell formation B. allantois, amniotic fluid formation C. yolk sac, placenta development D. amnion, umbilical cord formation E. chorion, neural system development